Bluetooth Mini Speaker. Bluetooth 2.1. Built-in Lithium-ion battery. Power Supply: Lithium-ion, Computer-USB-in, DC-in. Memory Play: Auto remember the last song & play mode played. Support TF card. Support all devices. Our company offers a professional and reliable service for the provision of all your business gifts and promotional products, from artwork generation through to sourcing, production and distribution. 60mm W x 56mm H